the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions
- 1Department of Physics and Astronomy, University of Bologna, Bologna, Italy
- 2Institute of Applied Physics, National Research Council (IFAC-CNR), Sesto Fiorentino (FI), Italy
- 3Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR) Bologna, Italy
- 4National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino (FI), Italy
- 5Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, Italy
- 6Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR), Torino, Italy
- 1Department of Physics and Astronomy, University of Bologna, Bologna, Italy
- 2Institute of Applied Physics, National Research Council (IFAC-CNR), Sesto Fiorentino (FI), Italy
- 3Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR) Bologna, Italy
- 4National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino (FI), Italy
- 5Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, Italy
- 6Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR), Torino, Italy
Abstract. The long-term comparison between simulated and observed spectrally resolved radiances can represent a stringent test for the direct verification and improvement of General Circulation Models (GCMs). From the mid of 2000s, stable hyperspectral observations of the Mid-Infrared region (667 to 2750 cm-1) the Earth emission spectrum have been provided by different sensors (e.g., AIRS, IASI and CrIS). In addition, the FORUM mission, selected to be the ninth ESA Earth Explorer mission, will measure, starting from 2027, the terrestrial radiation emitted to space at the top of the atmosphere (TOA) from 100 to 1600 cm-1 filling the observational gap in the far-infrared (FIR) region, from 100 to 667 cm-1.
In this work, in anticipation of FORUM measurements, we compare existing IASI observations to radiances simulated on the basis of the atmospheric fields predicted by the EC-Earth GCM (version 3.3.3) in clear-sky conditions. In order to simulate spectra based on the atmospheric and surface state provided by the climate model, the radiative transfer model σ-IASI has been implemented in the Cloud Feedback Model Intercomparison Project (COSP) package. Therefore, on-line simulations provided by EC-Earth model equipped with the new COSP + σ-IASI module have been performed in clear-sky conditions with prescribed sea surface temperature and sea-ice cover, every 6 hours, over a timeframe consistent with the availability of IASI data.
Systematic comparisons between observed IASI MetOp-A L1C data and model outputs have been performed in 10 cm-1 spectral intervals, on global and regional scales, by distinguishing the surface type (land, sea). The long term analysis shows a warm bias of the climate model in the roto-vibrational water vapour bands and in the CO2 absorption band. These biases represent a strong evidence of a temperature bias of the model in the upper-troposphere and in the stratosphere, while a cold bias occurs over land.
Stefano Della Fera et al.
Status: final response (author comments only)
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CEC1: 'Comment on egusphere-2022-479', Juan Antonio Añel, 24 Aug 2022
Dear authors,
I have to bring to your attention again the issue with the σ-IASI code previously raised by the Topical Editor. Unfortunately, I can not consider your excuse for not publishing it satisfactory, as it is a third-party model out of your control. Ultimately, you decided to use non-free software for your work, which goes against the principles of the scientific method and precludes the replicability and reproducibility of your study.
From your reply to the topical editor, I understand that you have discussed this with the authors of the model. Their reply does not seem too convincing. What prevents the authors of σ-IASI from publishing the code? It would be good to have a reply to this question.
However, what is more problematic is that the web server at the Università degli Studi della Basilicata is not a trustable repository for long-term archival, something necessary in scientific publication. Indeed, the web page of the model is not updated since 2010. If the email address that you provide to get access to σ-IASI becomes suddenly unresponsive, the accessibility to the code and, therefore, the replicability of your work would break. If the authors of σ-IASI do not want to publish the code, at minimum, if they want to use it for "scientific" purposes, they should store it in a suitable repository for scientific research (e.g. Zenodo) and issue a DOI for it, that you, for example, could cite as a user. This repository does not need to be accessible to anyone and, at the same time, would be trustable and citable. This is the bare minimum we need to ask you in this case.
Therefore, please, liaise with the σ-IASI authors to fix this situation, according to the exposed above, and reply to this comment with the new information (link and DOI) for the new repository. Also, modify the Code Availability Section of your manuscript accordingly in any potential reviewed version.
As a personal note, if the σ-IASI developers do not publish their code, I advise you to avoid using it in the future.
Juan A. Añel
Geosci. Model Dev. Executive Editor
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AC1: 'Reply on CEC1', Stefano Della Fera, 26 Aug 2022
Dear editor,
Thanks for the further information and suggestions.
As discussed before, we were already working with the sigma-iasi authors for the publication of the code in an accessible repository.
Thanks to the sigma-iasi authors, the code is now available on Zenodo at https://zenodo.org/record/7019991#.YwiMtXZBxD9 . I will add this information in the code-availability section in the next reviewed version of the manuscript.
Please, let us know if this action addresses the question with GMD guidelines.
Thanks again.
- CEC2: 'Reply on AC1', Juan Antonio Añel, 26 Aug 2022
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AC1: 'Reply on CEC1', Stefano Della Fera, 26 Aug 2022
- RC1: 'Comment on egusphere-2022-479', Anonymous Referee #1, 30 Sep 2022
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RC2: 'Comment on egusphere-2022-479', Anonymous Referee #2, 03 Nov 2022
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/egusphere-2022-479/egusphere-2022-479-RC2-supplement.pdf
Stefano Della Fera et al.
Stefano Della Fera et al.
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